d
\(C{{H}_{3}}C{{H}_{2}}CHO\) \(\mathop {\xrightarrow{{Aq.}}}\limits_{KOH} \) \(\,C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}C{{l}_{2}}\) \(\mathop {\xrightarrow{{Aq.}}}\limits_{KOH} \) \(C{{H}_{3}}-C\equiv CH+2KCl+{{H}_{2}}O\) \(\underset{C{{u}_{2}}C{{l}_{2}}/N{{H}_{3}}}{\mathop{\xrightarrow{{}}}}\,\,\) લાલા રંગ નો પદાર્થ